JP2000302407A - Carbon monoxide selective oxidation equipment - Google Patents

Abstract

(57) [PROBLEMS] To reduce the concentration of carbon monoxide in a hydrogen-rich gas and maintain the concentration of hydrogen in the hydrogen-rich gas high. SOLUTION: As a whole, a CO selective oxidizing apparatus 30 has a larger gas flow path cross-sectional area, a smaller gas flow path resistance, a smaller amount of introduced air, and a lower gas flow rate toward the downstream side along the flow of the hydrogen-rich gas. The number of air supply pipes to be used is large and the cooling effect is reduced. That is, the more downstream,
Using the case 32 having a large diameter, the catalyst filling portions 44 to 48 are used.
The catalyst is filled with a carrier supported on a carrier having a large particle size, the diameter of the air introduction pipes 54 to 58 is reduced, the number thereof is increased, and the number of cooling water passages 64 to 68 is reduced. . As a result, it is possible to cope with an increase in the amount of gas accompanying the introduction of air, the characteristics of the oxidation reaction of carbon monoxide, etc., thereby reducing the concentration of carbon monoxide in the hydrogen-rich gas and maintaining the hydrogen concentration at a high level. it can.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon monoxide selective oxidation apparatus, and more particularly, to a reaction tank filled with a catalyst for oxidizing carbon monoxide in a hydrogen-rich gas in preference to hydrogen in the presence of oxygen. And a carbon monoxide selective oxidizing apparatus.

[0002]

2. Description of the Related Art Conventionally, as a carbon monoxide selective oxidizing apparatus of this type, carbon monoxide in a hydrogen-rich gas obtained by steam reforming a hydrocarbon-based fuel in the presence of oxygen such as ruthenium or rhodium. A catalyst that oxidizes carbon monoxide in preference to hydrogen has been proposed (for example, Japanese Patent Application Laid-Open No. 5-201702). In this apparatus, the catalyst is housed in an elongated steel tube vessel, and is configured to introduce hydrogen-rich gas into the reaction vessel along its longitudinal direction together with air. Oxidizes carbon monoxide in rich gas.

[0003]

However, such a selective oxidation apparatus for carbon monoxide has a problem that the concentration of carbon monoxide in the hydrogen-rich gas cannot be sufficiently reduced. This means that even if the amount of oxygen necessary to oxidize carbon monoxide in the hydrogen-rich gas is supplied to the reaction vessel,
This is based on the fact that the oxygen concentration in the hydrogen-rich gas is high near the inlet of the reaction vessel, so that in addition to the oxidation reaction of carbon monoxide, an oxidation reaction of hydrogen is also performed, and oxygen for oxidizing carbon monoxide is consumed.

[0004] To cope with such a problem, it can be considered to increase the amount of introduced oxygen. However, an increase in the amount of introduced oxygen is accompanied by an increase in the amount of hydrogen to be oxidized. There is a problem that the content is reduced.

[0005] In order to solve these problems, the applicant has proposed a carbon monoxide selective oxidation apparatus for supplying oxygen from a plurality of locations along a flow of a hydrogen-rich gas to a reaction vessel filled with a catalyst. No. 6-204325). This device supplies oxygen from a plurality of locations to reduce the oxygen concentration in the hydrogen-rich gas to suppress the oxidation reaction of hydrogen and to perform the oxidation reaction of carbon monoxide throughout the reaction tank to reduce the concentration of carbon monoxide. To obtain a hydrogen-rich gas having an extremely low hydrogen content.

The carbon monoxide selective oxidizer of the present invention is a further improvement of the carbon monoxide selective oxidizer proposed by the applicant, and one of the objects is to reduce the concentration of carbon monoxide in a hydrogen-rich gas. I do. Another object of the present invention is to maintain a high concentration of hydrogen in a hydrogen-rich gas.

[0007]

Means for Solving the Problems and Their Functions and Effects The carbon monoxide selective oxidizing apparatus of the present invention employs the following means in order to achieve at least a part of the above object.

The first apparatus for selectively oxidizing carbon monoxide of the present invention comprises a reaction tank filled with a catalyst for oxidizing carbon monoxide in a hydrogen-rich gas in preference to hydrogen in the presence of oxygen. An oxidizing apparatus, comprising: an oxygen-containing gas supply unit configured to supply an oxygen-containing gas containing oxygen to the reaction tank from a plurality of locations along the flow of the hydrogen-rich gas. On the other hand, the point is that the gas flow path cross section is formed to be larger toward the downstream side.

In the first apparatus for selectively oxidizing carbon monoxide of the present invention, the oxygen-containing gas supply means is formed such that the gas flow path cross section becomes larger toward the downstream side of the flow of the hydrogen-rich gas. Then, an oxygen-containing gas containing oxygen is supplied from a plurality of locations along the flow of the hydrogen-rich gas. Since the reaction tank is formed such that the gas flow path cross section becomes larger toward the downstream side with respect to the flow of the hydrogen-rich gas,
Even if the amount of gas flowing into the reaction tank increases on the way due to the supply of the oxygen-containing gas, it is possible to prevent an increase in the discharge pressure of the gas on the outlet side of the reaction tank, thereby eliminating gas stagnation inside the reaction tank. Reactions such as a hydrocarbon conversion reaction of carbon oxide with hydrogen and a carbon monoxide conversion reaction of carbon dioxide can be prevented. As a result, the oxidation reaction of carbon monoxide can be performed smoothly.

[0010] In the first carbon monoxide selective oxidizing apparatus of the present invention, the reaction tank has a case formed so that the cross-sectional area increases toward the downstream side with respect to the flow of the hydrogen-rich gas. Can also.

The second apparatus for selectively oxidizing carbon monoxide of the present invention has a reaction tank filled with a catalyst for oxidizing carbon monoxide in a hydrogen-rich gas in preference to hydrogen in the presence of oxygen. An oxidizing apparatus, comprising: an oxygen-containing gas supply unit configured to supply an oxygen-containing gas containing oxygen to the reaction tank from a plurality of locations along the flow of the hydrogen-rich gas. On the other hand, the gist is that the catalyst is packed so that the gas flow resistance in the filled catalyst phase becomes smaller toward the downstream side.

[0012] In the second carbon monoxide selective oxidizing apparatus of the present invention, the oxygen-containing gas supply means reduces the flow resistance of the gas in the catalyst phase which is more filled toward the downstream side with respect to the flow of the hydrogen-rich gas. An oxygen-containing gas containing oxygen is supplied from a plurality of locations along a flow of a hydrogen-rich gas to a reaction tank filled with a catalyst. Since the reaction tank is filled with a catalyst such that the flow path resistance of the gas in the catalyst phase filled toward the downstream side with respect to the flow of the hydrogen-rich gas is reduced, the amount of gas flowing into the reaction tank by the supply of the oxygen-containing gas is reduced. Even if it increases on the way, it is possible to prevent an increase in the discharge pressure of the gas at the outlet side of the reaction tank, eliminate gas stagnation inside the reaction tank, and perform a reaction of hydrocarbon conversion with hydrogen of carbon monoxide and carbon dioxide. A reaction such as a reaction of carbon monoxide can be prevented. As a result, the oxidation reaction of carbon monoxide can be performed smoothly.

In the second apparatus for selectively oxidizing carbon monoxide of the present invention, the reaction vessel may have a plurality of filling portions filled with the catalyst so that the flow resistance of the gas in the catalyst phase is different. it can.

Further, in the first or second carbon monoxide selective oxidizing apparatus of the present invention, the reaction vessel is configured such that the catalyst is carried on a monolithic carrier having a smaller number of cells in the downstream of the flow of the hydrogen-rich gas. It can also be made. In this case, the reaction tank can be formed so that the gas flow path cross section becomes larger toward the downstream side with respect to the flow of the hydrogen-rich gas, and at the same time the catalyst phase is filled toward the downstream side with respect to the flow of the hydrogen-rich gas. The catalyst may be filled so that the gas flow path resistance is reduced. The “monolithic carrier” is a carrier composed of a plurality of cells that divide a gas flow path into a plurality of cells, and corresponds to, for example, a honeycomb tube.

In the first or second apparatus for selectively oxidizing carbon monoxide according to the present invention, the oxygen-containing gas supply means may further include an oxygen amount supplied to the reaction tank at a position downstream of the flow of the hydrogen-rich gas in the reaction tank. Or a means for supplying the oxygen-containing gas through a pipe having a smaller flow path section toward the downstream side of the flow of the hydrogen-rich gas in the reaction vessel. It can also be. Since the concentration of carbon monoxide in the hydrogen-rich gas is higher on the upstream side with respect to the flow of the hydrogen-rich gas in the reaction tank, the oxidation reaction of carbon monoxide occurs more frequently. Therefore, by supplying the oxygen-containing gas with a smaller amount toward the downstream side or by supplying the oxygen-containing gas with a pipe having a small channel cross section, it is possible to supply a more appropriate amount of oxygen for the oxidation reaction of carbon monoxide. It is. In the first or second carbon monoxide selective oxidizing apparatus of the present invention according to these aspects, means for supplying the oxygen-containing gas by increasing the number of pipes toward the downstream side of the flow of the hydrogen-rich gas in the reaction tank May be used. In this case, the diffusion and mixing of the oxygen-containing gas into the hydrogen-rich gas is performed quickly, so that carbon monoxide can be oxidized efficiently.

In the first or second apparatus for selectively oxidizing carbon monoxide of the present invention, the reaction may be performed such that the cooling effect on the reaction tank becomes lower toward the downstream of the flow of the hydrogen-rich gas in the reaction tank. A cooling means for cooling the tank may be provided. As described above, the oxidation reaction of carbon monoxide occurs more frequently on the upstream side with respect to the flow of the hydrogen-rich gas in the reaction tank. Therefore, by cooling the reaction tank so that the cooling effect becomes lower toward the downstream side, the temperature of the entire reaction tank can be made more uniform at an appropriate temperature. In the first or second carbon monoxide selective oxidizing apparatus according to the aspect of the present invention, the cooling unit may supply a cooling medium through a flow path having a smaller contact area toward a downstream side of the flow of the hydrogen-rich gas in the reaction tank. A means for circulating the cooling medium in the reaction vessel, or a means for circulating the cooling medium in the reaction vessel by decreasing the number of flow paths toward the downstream side of the flow of the hydrogen-rich gas in the reaction vessel. You can also. In this case, it is possible to provide a reaction tank having a gas flow path cross section that is larger toward the downstream side.

[0017]

Next, embodiments of the present invention will be described with reference to examples. FIG. 1 is a configuration diagram schematically showing the configuration of a reformer 20 including a CO selective oxidation device 30 according to one embodiment of the present invention. The reformer 20 is a device that obtains a hydrogen-rich gas to be supplied to a hydrogen consuming organization having a low allowable concentration of carbon monoxide, for example, a polymer electrolyte fuel cell or the like, by steam reforming a hydrocarbon-based fuel. A heating unit 22 for heating a mixed gas of a fuel (for example, methane or the like), an oxygen-containing gas (for example, air) containing water vapor and oxygen, and the heated mixed gas by the following formulas (1) to ( 3) a reforming section 24 for reforming to a hydrogen-rich gas by the reaction, a heat exchange section 26 for cooling the hydrogen-rich gas obtained by the reforming, and monoxide as a by-product contained in the cooled hydrogen-rich gas. C that oxidizes carbon in preference to hydrogen
An O selective oxidation device 30. The efficiency of the reforming reaction in the reforming section 24 is approximately 600 ° C. to 800 ° C.
Since the selective oxidation reaction in the O selective oxidation device 30 is efficiently performed at about 140 ° C. to 170 ° C., the hydrogen-rich gas is cooled in the heat exchange unit 26. Therefore, in the embodiment, the CO selective oxidation device 30 is
Is configured to oxidize carbon monoxide in a hydrogen-rich gas obtained by the reforming reaction of

CH ₄ + (１ ／) O ₂ → 2H ₂ + CO + 35.7 kJ (1) CH ₄ + H ₂ O → 3H ₂ + CO−206.2 kJ (2) CO + H ₂ O → H ₂ + CO ₂ +41.2 kJ ( 3)

FIG. 2 is a cross-sectional view schematically illustrating the configuration of the CO selective oxidation device 30 of the embodiment, and FIG. 3 is a cross-sectional view illustrating the AA cross section of the CO selective oxidation device 30 of the embodiment of FIG. It is. As shown in FIG.
0 is a case 32 forming the outer wall of the CO selective oxidation device 30
And a catalyst filling section 44 filled with a catalyst for oxidizing carbon monoxide in a hydrogen-rich gas in preference to hydrogen in the presence of oxygen.
To 48, air introduction pipes 54 to 58 for introducing air as an oxygen-containing gas containing oxygen into the hydrogen-rich gas, cooling water passages 64 to 68 as a cooling medium for cooling the catalyst filling portions 44 to 48. Is provided.

In the case 32, there are formed catalyst disposition portions 34 to 38 in which the flow passage cross-sectional area of the gas is increased in three stages from the upstream side along the flow of the hydrogen-rich gas.
A plurality of catalyst filling sections 44 to 48 corresponding to 4 to 38 are arranged. In the catalyst filling portions 44 to 48, a carrier that supports a catalyst (for example, ruthenium or rhodium) that oxidizes carbon monoxide in a hydrogen-rich gas in preference to hydrogen in the presence of oxygen is provided in the upstream catalyst filling portion. Packed to be dense. That is, the catalyst filling section 44 is filled with a carrier having a small particle size carrying a catalyst.
8 is filled with a carrier having a larger particle size than the carrier filled in the catalyst filling section 44 and carrying the catalyst. Needless to say, the catalyst filling portion 46 is filled with a carrier having a larger particle size than the carrier filled in the catalyst filling portion 44 and having a smaller particle size than the carrier filled in the catalyst filling portion 48 carrying the catalyst. Therefore, in the catalyst filling portions 44 to 48, the gas flow path cross section becomes larger toward the downstream side, and the gas flow path resistance becomes smaller.

The air introduction pipes 54 to 58 are arranged in the central portion of the case 32 upstream of the respective catalyst arrangement portions 34 to 38 so as to be orthogonal to the flow of the hydrogen-rich gas. The air introduction pipes 54 to 58 are arranged such that the flow path cross-sectional area of the air is smaller toward the downstream side along the flow of the hydrogen-rich gas, and the supply amount of the air becomes smaller toward the downstream side. As shown in FIG. 3, each of the air introduction pipes 54 to 58 has a plurality of air supply holes 54 a to 54 upstream of the hydrogen-rich gas.
8a are formed, and air is introduced into the hydrogen-rich gas.

The cooling water passages 64-68 are shown in FIGS.
As shown in FIG. 3, each of the catalyst filling portions 44 is formed as a flat and wide channel that is orthogonal to the flow of the hydrogen-rich gas.
~ 48. The cooling water passages 64 to 68 have the same shape, but are arranged such that the number of cooling water passages 64 to 68 decreases along the flow of the hydrogen-rich gas toward the downstream side. Therefore, the flow path cross section of the cooling water becomes smaller toward the downstream side, and the cooling effect becomes smaller.

In the CO selective oxidizing apparatus 30 of the embodiment configured as described above, the gas flow path cross-sectional area is larger and the gas flow path resistance is smaller toward the downstream side along the flow of the hydrogen-rich gas, so that the gas is introduced. The air amount is small, the number of air supply pipes to be introduced is large, and the cooling effect is reduced. Therefore, even if the gas flow rate is increased by the introduction of air, the gas can be flowed without stagnation, and the discharge pressure of the hydrogen-rich gas at the outlet of the CO selective oxidation device 30 can be prevented from increasing. As a result, it is possible to prevent a reverse reaction of a reforming reaction such as a reaction of converting carbon monoxide into hydrogen with hydrogen or a reaction of converting carbon monoxide to carbon monoxide, and to prevent an oxidation reaction of carbon monoxide. By performing the operation smoothly, the concentration of carbon monoxide in the hydrogen-rich gas can be extremely reduced. Also,
Since an amount of air is introduced from the air introduction pipes 54 to 58 in accordance with the progress of the oxidation reaction of carbon monoxide, the oxidation reaction of carbon monoxide can be performed prior to the oxidation reaction of hydrogen.
Moreover, since the number of air supply pipes is increased toward the downstream side so that the hydrogen-rich gas and air are easily mixed, carbon monoxide can be oxidized efficiently. As a result, a hydrogen-rich gas having a high hydrogen content can be obtained. Further, since the catalyst filling sections 44 to 48 are cooled in accordance with the progress of the oxidation reaction of carbon monoxide, the temperature of the entire CO selective oxidation device 30 can be set to a temperature suitable for the oxidation reaction of carbon monoxide. As a result, the oxidation reaction of carbon monoxide can be smoothly performed, and the concentration of carbon monoxide in the hydrogen-rich gas can be further reduced.

The reformer 20 of the embodiment has the case 32 formed so that the cross-sectional area increases in three steps along the flow of the hydrogen-rich gas, but the cross-sectional area is constant along the flow of the hydrogen-rich gas. A case may be provided.
FIG. 4 shows a schematic configuration of a CO selective oxidation device 130 according to a modification. The configuration corresponding to the configuration of the CO selective oxidizing device 30 of the embodiment among the configurations of the CO selective oxidizing device 130 of the modification is illustrated by adding a number to which 100 is added. As shown, the case 132 of the CO selective oxidation device 130 of the modified example
Has a constant cross section with respect to the flow of the hydrogen-rich gas.
However, by adjusting the particle size of the carrier of the catalyst filled in the catalyst filling units 144 to 148, even in the CO selective oxidizing apparatus 130 of the modified example, the gas flow becomes lower toward the downstream along the flow of the hydrogen-rich gas as a whole. The configuration can be such that the road cross-sectional area is large, the flow resistance of the gas is small, the amount of introduced air is small, the number of introduced air supply pipes is large, and the cooling effect is reduced. For example, the catalyst filling units 144 to
If a monolithic carrier (for example, a honeycomb tube illustrated in FIG. 5) supporting a catalyst is arranged at 148 and a monolithic carrier having a smaller number of cells is used on the downstream side, The gas flow path area can be increased toward the downstream side and the gas flow path resistance can be reduced. Therefore, in the CO selective oxidizing device 130 of this modification, the same effect as that of the CO selective oxidizing device 30 of the above-described embodiment can be obtained, and the case 132 that does not change the cross-sectional area can be used.
There is also an effect that the installation of the CO selective oxidation device 130 can be facilitated.

In the CO selective oxidizing device 30 of the embodiment and the CO selective oxidizing device 130 of the modified example, the gas flow path cross-sectional area becomes larger and the gas flow resistance becomes smaller toward the downstream side along the flow of the hydrogen-rich gas. Although the amount of introduced air is small, the number of introduced air supply pipes is large, and the cooling effect is reduced, it is not necessary to provide all of these elements. The element may not be provided. For example, a configuration in which only the element whose gas flow path cross-sectional area increases toward the downstream side along the flow of the hydrogen-rich gas from all of the above-described elements, or a configuration in which only the element in which the gas flow path resistance decreases is introduced. A configuration in which only the element that reduces the amount of air to be removed is removed, a configuration in which only the element that increases the number of introduced air supply pipes is removed, and a configuration in which only the element that reduces the cooling effect is removed may be used. The configuration may be removed in combination.

The CO selective oxidizing apparatus 30 of the embodiment and the CO selective oxidizing apparatus 130 of the modified example are described as selectively oxidizing carbon monoxide in a reformed gas obtained by steam reforming a hydrocarbon fuel. However, any device that oxidizes carbon monoxide in a hydrogen-rich gas in preference to hydrogen in the presence of oxygen can be applied to any hydrogen-rich gas. Therefore, the CO selective oxidizing device 30 of the embodiment and the CO selective oxidizing device 130 of the modified example have been described as a part of the reforming device 20, but may not include other components of the reforming device 20. Of course, it does not need to be part of the reformer 20.

In the CO selective oxidizing device 30 of the embodiment and the CO selective oxidizing device 130 of the modified example, the monoxide in the hydrogen-rich gas supplied to a hydrogen consuming engine having a low allowable concentration of carbon monoxide such as a polymer electrolyte fuel cell. Although it has been described that carbon is selectively oxidized, carbon monoxide in a hydrogen-rich gas supplied to any hydrogen consuming engine may be selectively oxidized.

The embodiments of the present invention have been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various embodiments may be made without departing from the scope of the present invention. Of course, it can be carried out.

[Brief description of the drawings]

FIG. 1 is a CO selective oxidation apparatus 3 according to an embodiment of the present invention.
FIG. 1 is a configuration diagram illustrating an outline of a configuration of a reforming apparatus 20 provided with 0.

FIG. 2 is a cross-sectional view schematically illustrating the configuration of a CO selective oxidation device 30 according to an embodiment.

FIG. 3 is a diagram A- of the CO selective oxidation apparatus 30 of the embodiment of FIG. 2;
It is sectional drawing which illustrates A cross section.

FIG. 4 is a cross-sectional view schematically showing a configuration of a CO selective oxidation device 130 according to a modification.

FIG. 5 is a cross-sectional view illustrating a cross section of a honeycomb tube as an example of a monolithic carrier.

[Explanation of symbols]

20 reformer, 22 heating unit, 24 reforming unit, 26
Heat exchange unit, 30 CO selective oxidizer, 32 cases, 3
4-38 Catalyst placement part, 44-48, 144-148
Catalyst filling section, 54 to 58 air introduction pipe, 64 to 68 cooling water passage, 130 Modified CO selective oxidation apparatus.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01M 8/10 B01D 53/36 103C (72) Inventor Toshitake Suzuki 1st Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Inside (72) Inventor Masahiro Inoue 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Satoshi 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 4D048 AA13 AB01 BA32Y BA33Y BB02 CC22 CC24 CC29 CC32 CC43 4G040 EA03 EB32 EB46 FA02 FB04 FC07 FE03 FE04 4G069 AA01 AA03 AA15 BC70A BC70B BC71A BC71B CA07 CA14 EA19 EE03 5H026 AA065H01A

Claims (11)

[Claims] An apparatus for selectively oxidizing carbon monoxide having a catalyst for oxidizing carbon monoxide in a hydrogen-rich gas in preference to hydrogen in the presence of oxygen. Oxygen-containing gas supply means for supplying an oxygen-containing gas containing oxygen to the reaction vessel from a plurality of locations along the reaction vessel, wherein the reaction vessel has a gas flow path cross section that is more downstream with respect to the flow of the hydrogen-rich gas. A carbon monoxide selective oxidation device formed as follows. 2. The apparatus for selectively oxidizing carbon monoxide according to claim 1, wherein the reaction tank includes a case formed such that a cross-sectional area increases toward the downstream side of the flow of the hydrogen-rich gas. 3. A carbon monoxide selective oxidizing apparatus having a reaction tank filled with a catalyst for oxidizing carbon monoxide in a hydrogen-rich gas in preference to hydrogen in the presence of oxygen, wherein the flow of the hydrogen-rich gas is Oxygen-containing gas supply means for supplying an oxygen-containing gas containing oxygen to the reaction vessel from a plurality of points along the reaction vessel, wherein the reaction vessel has a gas in a catalyst phase that is filled more downstream as the hydrogen-rich gas flows. A selective oxidation device for carbon monoxide, which is filled with a catalyst so as to reduce the flow path resistance. 4. The apparatus for selectively oxidizing carbon monoxide according to claim 3, wherein the reaction tank has a plurality of filling portions filled with the catalyst so that gas flow resistance in a catalyst phase is different. 5. The apparatus for selectively oxidizing carbon monoxide according to claim 1, wherein the catalyst is supported on a monolithic carrier having a smaller number of cells in a downstream side of the flow of the hydrogen-rich gas. 6. The oxygen-containing gas supply means is a means for supplying the oxygen-containing gas such that the amount of oxygen to the reaction tank decreases toward the downstream of the flow of the hydrogen-rich gas in the reaction tank. Item 6. A carbon monoxide selective oxidation device according to any one of Items 1 to 5. 7. The oxygen-containing gas supply means is a means for supplying the oxygen-containing gas through a pipe having a smaller flow path cross section toward the downstream side of the flow of the hydrogen-rich gas in the reaction tank. The carbon monoxide selective oxidizing device according to the above. 8. The oxygen-containing gas supply means for supplying the oxygen-containing gas by increasing the number of pipes toward the downstream side of the flow of the hydrogen-rich gas in the reaction tank. Carbon monoxide selective oxidation equipment. 9. A cooling means for cooling the reaction tank so that the cooling effect on the reaction tank is lower on the downstream side of the flow of the hydrogen-rich gas in the reaction tank.
9. The apparatus for selectively oxidizing carbon monoxide according to any one of claims 8 to 8. 10. The cooling means according to claim 9, wherein the cooling means circulates a cooling medium to the reaction tank through a flow path having a smaller contact area toward the downstream side of the flow of the hydrogen-rich gas in the reaction tank. Carbon oxide selective oxidation equipment. 11. The cooling means according to claim 9, wherein the cooling medium is circulated to the reaction vessel by decreasing the number of flow paths toward the downstream side of the flow of the hydrogen-rich gas in the reaction vessel. Carbon oxide selective oxidation equipment.